How to use collectionView method of CollectionViewController class

...11    12    var currentIndexPath: IndexPath?13    var data: [Prayer] = []14    15    let collectionViewController: UICollectionViewController = {16        let collectionViewController = UICollectionViewController(collectionViewLayout: UICollectionViewFlowLayout())17        collectionViewController.collectionView.isPagingEnabled = true18        collectionViewController.collectionView.showsHorizontalScrollIndicator = false19        collectionViewController.collectionView.contentInset = UIEdgeInsets(top: 10, left: 0, bottom: 0, right: 0)20        collectionViewController.collectionView.alpha = 021        return collectionViewController22    }()23    24    let activityIndicatorView: UIActivityIndicatorView = {25        var activityIndicatorView: UIActivityIndicatorView26        27        if #available(iOS 13.0, *) {28            activityIndicatorView = UIActivityIndicatorView(style: .large)29        } else {30            // Fallback on earlier versions31            activityIndicatorView = UIActivityIndicatorView()32        }33        34        return activityIndicatorView35    }()36    let dismissLabel: Button = {37        let button = Button("Повернутися", fontSize: 14, fontColor: .lightGrayCustom)38        button.addTarget(self, action: #selector(dismissViewController), for: .touchUpInside)39        40        return button41    }()42    let dismissButton: UIButton = {43        let button = UIButton()44        let image = UIImage(named: "arrow-down")45        let imageTint = UIImage(named: "arrow-down")?.withRenderingMode(.alwaysTemplate)46        button.setImage(image, for: .normal)47        button.setImage(imageTint, for: .highlighted)48        button.addTarget(self, action: #selector(dismissViewController), for: .touchUpInside)49        50        return button51    }()52    53    override func viewDidLoad() {54        super.viewDidLoad()55        self.collectionViewController.collectionView.delegate = self56        self.collectionViewController.collectionView.dataSource = self57        // Do any additional setup after loading the view.58        self.collectionViewController.collectionView.register(PrayerDetailsCollectionViewCell.self, forCellWithReuseIdentifier: PrayerDetailsCollectionViewCell.reuseIdentifier)59        60        if let layout = self.collectionViewController.collectionView.collectionViewLayout as? UICollectionViewFlowLayout {61            layout.scrollDirection = .horizontal62            layout.minimumLineSpacing = 063            layout.minimumInteritemSpacing = 064        }65        66        if #available(iOS 13.0, *) {67            self.view.addSubviews([self.collectionViewController.collectionView, self.dismissButton, self.activityIndicatorView])68        } else {69            self.view.addSubviews([self.collectionViewController.collectionView, self.dismissLabel, self.dismissButton, self.activityIndicatorView])70        }71        72        self.activityIndicatorView.startAnimating()        73    }74    75    override func viewWillLayoutSubviews() {76        super.viewWillLayoutSubviews()77        setupLayout()78    }79    80    override func viewDidAppear(_ animated: Bool) {81        super.viewDidAppear(animated)82        // Do any additional setup before appearing the view.83        if let indexPath = self.currentIndexPath {84            if let rect = self.collectionViewController.collectionView.layoutAttributesForItem(at: indexPath)?.frame {85                DispatchQueue.main.async {86                    self.collectionViewController.collectionView.scrollRectToVisible(rect, animated: false)87                }88            }89            self.activityIndicatorView.stopAnimating()90            UIView.animate(withDuration: 0.5) {91                self.collectionViewController.collectionView.alpha = 192            }93            self.currentIndexPath = nil94        }95    }96    97    private func setupLayout() {98        self.view.backgroundColor = .white99        if #available(iOS 13.0, *) {100            self.dismissButton.anchor(top: self.view.topAnchor, padding: UIEdgeInsets(top: 8, left: 0, bottom: 0, right: 0), size: CGSize(width: 0, height: 16))101        } else {102            // Fallback on earlier versions103            self.dismissButton.anchor(top: self.view.topAnchor, padding: UIEdgeInsets(top: 48, left: 0, bottom: 0, right: 0), size: CGSize(width: 0, height: 16))104            self.dismissLabel.anchor(leading: self.view.leadingAnchor, bottom: self.dismissButton.topAnchor, trailing: self.view.trailingAnchor, padding: UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0))105        }106        self.dismissButton.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true107        self.activityIndicatorView.anchor(centerY: self.view.centerYAnchor, centerX: self.view.centerXAnchor)108        self.collectionViewController.collectionView.backgroundColor = .white109//        self.collectionViewController.collectionView.anchor(top: self.dismissButton.bottomAnchor, leading: self.view.leadingAnchor, bottom: self.view.bottomAnchor, trailing: self.view.trailingAnchor, padding: .zero)110        self.collectionViewController.collectionView.pin.below(of: self.dismissButton).marginTop(0).horizontally().bottom()111    }112    113}114extension PrayerDetailsCollectionViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {115    116    // MARK: UICollectionViewDataSource117    118    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {119        let size = CGSize(width: collectionViewController.collectionView.bounds.size.width, height: collectionViewController.collectionView.bounds.size.height)120        return size121    }122    123    func numberOfSections(in collectionView: UICollectionView) -> Int {124        // #warning Incomplete implementation, return the number of sections125        return 1126    }127    128    129    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {130        // #warning Incomplete implementation, return the number of items131        return self.data.count132    }133    134    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {135        guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: PrayerDetailsCollectionViewCell.reuseIdentifier, for: indexPath) as? PrayerDetailsCollectionViewCell else { return UICollectionViewCell() }136        137        // Configure the cell138        let data = self.data[indexPath.item]139        cell.configureWithData(data: data)140        cell.layoutIfNeeded()141        return cell142    }143    144    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {145        print(indexPath)146    }147    148    149    @objc func dismissViewController(_ sender: UIButton!) {150        self.dismiss(animated: true, completion: nil)151    }152    153}...

...30import UIKit31public protocol CollectionViewDelegate: UICollectionViewDelegate {}32public protocol CollectionViewDataSource: UICollectionViewDataSource {33  /**34   Retrieves the data source items for the collectionView.35   - Returns: An Array of DataSourceItem objects.36   */37  var dataSourceItems: [DataSourceItem] { get }38}39extension UIViewController {40  /**41   A convenience property that provides access to the CollectionViewController.42   This is the recommended method of accessing the CollectionViewController43   through child UIViewControllers.44   */45  public var collectionViewController: CollectionViewController? {46    return traverseViewControllerHierarchyForClassType()47  }48}49open class CollectionViewController: ViewController {50  /// A reference to a Reminder.51  open let collectionView = CollectionView()52  53  open var dataSourceItems = [DataSourceItem]()54  55  open override func prepare() {56    super.prepare()57    prepareCollectionView()58  }59  60  open override func layoutSubviews() {61    super.layoutSubviews()62    layoutCollectionView()63  }64}65extension CollectionViewController {66  /// Prepares the collectionView.67  fileprivate func prepareCollectionView() {68    collectionView.delegate = self69    collectionView.dataSource = self70    view.layout(collectionView).edges()71  }72}73extension CollectionViewController {74  /// Sets the frame for the collectionView.75  fileprivate func layoutCollectionView() {76    collectionView.frame = view.bounds77  }78}79extension CollectionViewController: CollectionViewDelegate {}80extension CollectionViewController: CollectionViewDataSource {81  @objc82  open func numberOfSections(in collectionView: UICollectionView) -> Int {83    return 184  }85  86  @objc87  open func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {88    return dataSourceItems.count89  }90  91  @objc92  open func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {93    return collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionViewCell", for: indexPath)94  }95}...

...3class WatchlistViewController: MainViewController {4    override func viewDidLoad() {5        super.viewDidLoad()6        7        collectionViewController.paginated = false8    }9    10    override func viewWillAppear(_ animated: Bool) {11        load(page: -1) // Refresh watchlsit12        super.viewWillAppear(animated)13    }14    15    override func load(page: Int) {16        let group = DispatchGroup()17        18        group.enter()19            self.collectionViewController.dataSources = [WatchlistManager<Movie>.movie.getWatchlist { [unowned self] (updated) in20                self.collectionViewController.dataSources[0] = updated.sorted(by: {$0.title < $1.title})21                self.collectionViewController.collectionView?.reloadData()22                self.collectionViewController.collectionView?.collectionViewLayout.invalidateLayout()23            }.sorted(by: {$0.title < $1.title})]24        self.collectionViewController.dataSources.append(WatchlistManager<Show>.show.getWatchlist { [unowned self] (updated) in25                self.collectionViewController.dataSources[1] = updated.sorted(by: {$0.title < $1.title})26                self.collectionViewController.collectionView?.reloadData()27    self.collectionViewController.collectionView?.collectionViewLayout.invalidateLayout()28            }.sorted(by: {$0.title < $1.title}))29        30            self.collectionViewController.collectionView?.reloadData()31        self.collectionViewController.collectionView?.collectionViewLayout.invalidateLayout()32        33    }34    35    override func collectionView(_ collectionView: UICollectionView, titleForHeaderInSection section: Int) -> String? {36        if section == 0 {37            return "Movies".localized38        } else if section == 1 {39            return "Shows".localized40        }41        return nil42    }43    44    override func collectionView(_ collectionView: UICollectionView, insetForSectionAt section: Int) -> UIEdgeInsets? {45        let isTv = UIDevice.current.userInterfaceIdiom == .tv46        47        return isTv ? UIEdgeInsets(top: 60, left: 90, bottom: 0, right: 90) : UIEdgeInsets(top: 5, left: 15, bottom: 15, right: 15)48    }49    50    override func collectionView(isEmptyForUnknownReason collectionView: UICollectionView) {51        if let background: ErrorBackgroundView = .fromNib() {52            background.setUpView(title: "Watchlist Empty".localized, description: "Try adding movies or shows to your watchlist.".localized)53            collectionView.backgroundView = background54        }55    }56}...

1class CollectionViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {2    override func viewDidLoad() {3        super.viewDidLoad()4        let layout = UICollectionViewFlowLayout()5        collectionView = UICollectionView(frame: view.frame, collectionViewLayout: layout)6        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "cell")7        view.addSubview(collectionView)8    }9    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {10    }11    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {12        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)13    }14    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {15        return CGSize(width: view.frame.width, height: 50)16    }17}

1import UIKit2class CollectionViewController: UICollectionViewController {3    override func viewDidLoad() {4        super.viewDidLoad()5        collectionView?.register(CollectionViewCell.self, forCellWithReuseIdentifier: "cellId")6    }7    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {8    }9    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {10        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as! CollectionViewCell11    }12}13import UIKit14class CollectionViewController: UICollectionViewController {15    override func viewDidLoad() {16        super.viewDidLoad()17        collectionView?.register(CollectionViewCell.self, forCellWithReuseIdentifier: "cellId")18    }19    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {20    }21    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {22        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as! CollectionViewCell23    }24}25import UIKit26class CollectionViewController: UICollectionViewController {27    override func viewDidLoad() {28        super.viewDidLoad()29        collectionView?.register(CollectionViewCell.self, forCellWithReuseIdentifier: "cellId")30    }31    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {32    }33    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {34        let cell = collectionView.dequeueReusableCell(with

1import UIKit2class CollectionViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {3    var images = [UIImage]()4    override func viewDidLoad() {5        super.viewDidLoad()6        self.collectionViewLayout = UICollectionViewFlowLayout()7        self.collectionViewLayout.sectionInset = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)8        self.collectionViewLayout.itemSize = CGSize(width: 100, height: 100)9        self.collectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: self.collectionViewLayout)10        self.collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "cell")11        self.view.addSubview(self.collectionView)12        self.images.append(UIImage(named: "1")!)13        self.images.append(UIImage(named: "2")!)14        self.images.append(UIImage(named: "3")!)15        self.images.append(UIImage(named: "4")!)16        self.images.append(UIImage(named: "5")!)17        self.images.append(UIImage(named: "6")!)18        self.images.append(UIImage(named: "7")!)19        self.images.append(UIImage(named: "8")!)20        self.images.append(UIImage(named: "9")!)21        self.images.append(UIImage(named: "10")!)22        self.images.append(UIImage(named: "11")!)23        self.images.append(UIImage(named: "12")!)24        self.images.append(UIImage(named: "13")!)25        self.images.append(UIImage(named: "14")!)26        self.images.append(UIImage(named: "15")!)27        self.images.append(UIImage(named: "16")!)28        self.images.append(UIImage(named: "17")!)29        self.images.append(UIImage(named: "18")!)30        self.images.append(UIImage(named: "19")!)31        self.images.append(UIImage(named: "20")!)32        self.images.append(UIImage(named: "21")!)33        self.images.append(UIImage(named: "22")!)34        self.images.append(UIImage